frp
frp is a free tool that lets a computer behind a home or office network be reached from the internet, without opening ports on the router. It is aimed at people and IT staff who need to reach a private server or app from outside, and it requires running a small program on a public server.
How hard it is to start using it. Easy: install it like a normal app, or use it in your browser. Advanced: you run it on your own server, use the command line, or it is a tool for developers.
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